Be gentle to all and stern with yourself.
Well done is better than well said.
The most effective way to do it, is to do it.
What you do today can improve all your tomorrows.
Without hard work, nothing grows but weeds.
Go for it now. The future is promised to no one.
Always desire to learn something useful.
Either you run the day or the day runs you.
Never complain and never explain.
Wherever you are - be all there.
I have taught history on the high school and college levels, and am or have been a lecturer at the Smithsonian, The National Institutes of Health, and numerous colleges and universities, mostly on science fiction and technology subjects.